7220389 has 16 divisors (see below), whose sum is σ = 8156736. Its totient is φ = 6336000.

The previous prime is 7220383. The next prime is 7220407. The reversal of 7220389 is 9830227.

It is not a de Polignac number, because 7220389 - 2⁷ = 7220261 is a prime.

It is a super-2 number, since 2×7220389² = 104268034622642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7220389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71439 + ... + 71539.

It is an arithmetic number, because the mean of its divisors is an integer number (509796).

Almost surely, 2^7220389 is an apocalyptic number.

It is an amenable number.

7220389 is a deficient number, since it is larger than the sum of its proper divisors (936347).

7220389 is a wasteful number, since it uses less digits than its factorization.

7220389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 7220389 is about 2687.0781529386. The cubic root of 7220389 is about 193.2799770187.

The spelling of 7220389 in words is "seven million, two hundred twenty thousand, three hundred eighty-nine".